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Message: <blockquote data-quote="helotaxi" data-source="post: 2820288" data-attributes="member: 550915">Well If you're really worried about it, here's what I would do...Run 12ga to the battery.  Fuse it near the battery with a 20A fuse.  Run it to an automotive relay.  The output of the relay goes to the switched lead of the deck (yellow or yellow/red).  The factory ignition switched wire is used as a trigger for the relay.  The factory constant wire can be used as is since all it really does is maintain the memory for the station presets and so forth.  Don't use the factory ground in any case.  The Alpine harness should have a terminal on the end of the ground wire, ground this to structural metal under the dash.</blockquote>

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